Fertilisation Study guides, Class notes & Summaries

germinal stage - begins with zygote being formed by fertilisation of the egg and ends when the zygote is implanted in the wall of the uterus (happens after 7 days). 2 week period. zygote - developing organism from the time sperm and egg fuse to about the second week of gestation during which it undergoes rapid cell divison embryonic stage - lasts from the second to around eighth week of gestation

Edexcel A Level Biology Paper 1 Mark Scheme June 2022 | Advanced Biochemistry | Microbiology and Genetics.A description that makes reference to three of the following: • (contact between sperm and secondary oocyte results in) acrosome reaction (1) • meiosis is completed (1) • cortical reaction takes place (1) • fusion of sperm {nucleus / genetic material} with {nucleus genetic material} of ovum (1) ACCEPT ovum / egg cell / female gamete description e.g. enzymes are released from...

what is oviparity? correct answers eggs are laid, with little or no embryonic development in the mother with either internal/external fertilisation - found in invertebrates, fish amphibians, reptiles, birts and monotreme animals what is ovoviviparity? correct answers eggs retained in mother's body until ready to hatch, with internal fertilisation and young are born lice - no placental connection to mother - found in invertebrates, fish, amphibians and reptiles what is viviparity? corre...

PASS HUBS1406 - Reproduction and Development 100% Solved Gonad A primary sex organ, such as the ovary and teste Testosterone Male sex hormone Oestrogen A female sex hormone which develops and maintains female sex characteristics Progesterone A female sex hormone which prepares the body for pregnancy Diploid A cell which has two complete sets of chromosomes Haploid A cell which has one complete set of chromosomes Testis A male reproductive structure which produces sperm ...

Edexcel A Level Biology: Topic 3 Quiz with complete solutions | Latest 2023/2024 Prokaryotic cell -- Cells that don't have a nucleus and other membrane bound organelles. Eukaryotic cell -- DNA=Linear, DNA inside nucleus, no cell wall, mitochondria present, larger ribosomes. Mitochondrion -- Inner of its two membranes folded to form finger-like projections called cristae. Site of aerobic respiration and produces ATP. Nucleus -- Enclosed by envelope composed of two membranes perforated by ...

Describe the events of fertilisation that occur after the acrosome reaction. correct answers -Membrane of sperm and egg cell fuse together -cortical granules release contents into zona pellucida -Zona pellucida thickens -Haploid nuclei fuse Explain how phospholipids form a cell surface membrane correct answers -Hydrophilic parts associate with water -Hydrophobic parts repel water -a bilayer forms with hydrophobic parts pointing in towards the centre of the bilayer Describe the role...

GCSE COMBINED SCIENCE: SYNERGY 8465/1F Foundation Tier Paper 1 Life and Environmental Sciences Version: 1.0 Final G/LM/Jun23/E7 8465/1F (JUN2384651F01) GCSE COMBINED SCIENCE: SYNERGY Foundation Tier Paper 1 Life and Environmental Sciences Tuesday 16 May 2023 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: l a ruler l a protractor l a scientific calculator l the periodic table (enclosed) l the Physics Equations Sheet (enclosed). Instructions l Use...

the name given to the cell which is formed immediately after fertilisation is a)foetus b)embryo c)zygote d)corpus luteum Zygote During the first part of this in desincrustation the positive pole of the galvanic unit should a)be held in clients hand b)be held by the esthetician c)not be held at all d)not be connected to The Appratus a)be held in clients hand Fungi are a)vegetaable type microorganisms lacking chlorophyll b)single-celled micro-organisms c)very tiny organisms that mul...

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE BIOLOGY Higher Tier Paper 2H H 2 *02* IB/M/Jun21/8461/2H Answer all questions in the spaces provided. 0 1 The nucleus of a cell contains DNA. 0 1 . 1 Name the structures inside the cell nucleus that contain DNA. [1 mark] Figure 1 shows part of a DNA molecule. Figure 1 0 1 . 2 Name the part of the DNA molecule labelled X. [1 mark] ...

chorion - The membrane that together with the endometrium, forms the placenta. / The outermost extra-embryonic membrane surrounding the embryo. pregnancy - The period of development of an embryo in the uterus between fertilisation and birth. diabetes mellitus - Disease characterised by a lack of insulin production. eustachian tube - Tube that connects the pharynx and the middle ear. / The structure in the ear that equalises the pressure on either side of the eardrum. eutrophication -...